Adjustable holder for turning crank shafts



, ADJUSTABLE HOLDER FOR TURNING CRANK SHAFTS Filed Mar. 4, 1922 3 sheets-sheet 1 Apr. 10, 1923. 1,451,078 W. L. MANTHA ADJUSTABLE HOLDER FOR TURNING CRANK SHAFTS Filed Mar. 192.2

5 sheets-sheet 2 Apr. 10, 1923 r w. L. MANTHA ADJUSTABLE HOLDER FOR TURNING CRANK SHAFTS Filed Mar. 4, 1922 5 sheets-sheet 3 @EEE v (1H0: 142 s Patented Apr. 10, 1923.

WILLIAM L. MANTHA. OF BAYPORT, NEW YORK.

ADJUSTABLE HOLDER FOR TURNING CRANK SHAIETS.

Application filed March 4, 1922.

To all whom it may concern:

Be it known that I, W ILLIAM L. MANTHA, a citizen of the United States, residing at Bayport, in the county of Suffolk and State of New York. have invented certain new and useful Improvements in Adjustable Holders for Turning Crank Shafts, of which the following is a specification, reference being had therein to the accompanying draw- 0 ings.

This invention relates to an adjustable set of holders for turning and truing crank shafts and eccentrics. The principal object of this invention is the production of a simple and efficient holder wherein the centers may be adjusted to a minute adjustment for the purpose of permitting a very accurate turning of crank shafts adapted to be supported thereby.

A still further object of this invention is the production of a very simple and efiicient means for adjusting the centers to a proper point and then firmly and efficiently holding these centers in their proper adjusted posi tionS.

With these and other objects in view this invention consists of certain novel coinbinations, constructions, and arrangements of parts as will be hereinafter fully described and claimed.

In the accompanying drawings Figure 1 is a perspective view of a portion of the lathe showing the holders in position upon the lathe and supporting a crank shaft.

Figure 2 is a top plan view of the holder which is adapted to engage the dead center of the lathe.

Figure 3 is an end elevation of the structure shown in Figure 2.

Figure a is a side elevation of the structure shown in Figures 2 and 3.-

Figure 5 is a section taken on line 55, of Figure 3.

Figure 6 is a vertical section taken through the structure shown in Figures 2, 3 and 4 showing the manner in which the dead center engages the holder.

Figure 7 is an enlarged vertical section through a portion of the center receiving sockets.

Figure 8 is a perspective view of one of the sleeves used in connection with the present invention for facilitating the adjustment of the holder to different size shafts.

Figure 9 is a front elevation of the Serial No. 541,140.

holder which is adapted to engage the face plate of the lathe.

Figure 10 is a side elevation of the struc ture shown in Figure 9.

Figure 11 is a rear elevation of the structure shown in Figure 9.

Figure 12 is a vertical section taken through the structure shown in Figures 9, 10 and 11 showing the manner in which the same engages the face 'plateof the lathe.

Figure 13 is a detail perspective view of the adjustable center receiving plate carried by the structure shown in Figures 9, 10 and 11. V

Figure 14 is a section taken on line XX of Figure 9, the crank shaft and face plate being shown in connection therewith.

Figure 15 is a perspective view of the" filler sleeve carried by the holder adapted to be supported upon the face plate of the lathe. 1

Figure 16 is a detail perspective of the binding washer which is adapted to facili-x tate the clamping of the center receiving plate upon the center receiving plate holder.

Figure 17 is a section taken on line 1717, Figure 3.

By referring to the drawings it will be seen that 1 designates the lathe which is provided with the usual head stock 2'and tail stock 3. The head stock 2 is adapted to carry a face plate 4 of the usual con struction having a plurality of radiating notches 5 formed therein. The face plate 4 is provided with a center 6, which center is adapted to engage one of the sockets 7 of the adjustable center plate or head 8. The center plate. or head 8 is provided with a plurality of sockets 7 as above stated, the outer ends of which are flared to produce conical pocket portions 9. The construction of the sockets 7 is similar to the sockets formed in the center plate 10 carried by the companion holder and the same numerals are applied to both sockets for the purpose of convenience. Special attention is invited to Figure 7 as to the construction of these sockets 7 I One of the holders 11 is adapted to be secured adjacent the face plate 4 and this holder 11 is provided with a pair of side flanges 12 and is also provided with a centrally located vertically extending slot 13. An adjusting screw 14; is mounted within the slot 13 and is provided with a screw head 15 for facilitating the rotation of the screw in order that the center plate 8 may be adjusted to the desired position thereon.

The holder 11 is provided with a sleeve portion 16 near the lower end thereof which is adapted to receive a filler sleeve 17 of varying size to permit the holder to be firmly and efliciently secured upon the crank shaft 18. The sleeve portion 16 is provided with a depending portion 19 through which is extended a plurality of clamping bolts 20. These bolts project through the apertures 21 formed in the sleeve 17 and in this manner engage the crank shaft 18 for firmly locking the holder 11 in engagement with the crank shaft 18. The holder 11 is provided with a laterally extending ear 22, which car is adapted to receive the locking bolt 23, which locking bolt projects through one of the notches 5 in the plate 4 and firmly holds the holder 11 in an anchored position upon. the face plate so as to cause the holder to rotate with the face plate.

The opposite end of the crank shaft 18 engages a second holder 24 of similar con struction to the holder 11 with few modifications. The holder 24, however, is provided with a detachable bottom section 25 which is firmly secured to the upper section thereof by means of the bolts 26. A seetional sleeve 27 is adapted to be seated in the aperture 28 of the holder 24 and support one end of the crank shaft 18. An adjustable center plate or head 8 similar to the one just described in connection with the holder 11 is supported and adjustably mounted upon the holder 24 by means of a threaded bolt 29. The holder 24: is provided with a socket 24. in which the head of the bolt 29 fits as shown in Figures 6 and 17. In this way, it will be seen that it will be impossible for a foreign object to engage the head and cause it to accidentally move. Furthermore, it will be noted that the nut 29 bears upon the outer closed end of the slot, thus" holding the bolt against accidental rotation by vibration or jarring by causing a binding action upon the threads of the bolts. It will also be noted that the inner end of the'bolt will fit within the socket 365 formed in the inner closed end of the socket, whereby the bolt will be held from bending intermediate its ends. "This center plate 8 is adapted to be" engaged by the dead center 30 carried the tail stock of the lathe. It will, there fore, be s'e'enthat the crank shaft may readily rotate for the purpose of trimming or turning and that the entire device may rotate upon the dead center 30, the crank shaftbeingdriv'en by "means of the face plate 4. :"Attention is now invited to Figures 3 and 11 and it will be seen that a plurality of graduations 31 and 32 respectively are formed upon the holders, and also a plurality of indicating marks 33 and 34 respectively are formed upon the center plates 8 of the respective holders to permit the adjustment of the holders to be readily calcu lated and determined, whereby the holders may be adjusted to a predetermined point with the least inconvenience to the operator.

By considering Figure 13 it will be seen that the center plates 8 are each provided with a squared shoulder 35 having a threaded aperture 36 formed therein, which. threaded aperture is adapted to receive the threaded bolts 14 and 29 respectively. i

laterally projecting stud 37 is employed upon the shoulder 35 and is adapted to receive the clamping nut 38 and also the clamping washer 39. It should be understood that the washer 39 is adapted to firmly engage the inner face of the respective holders, and by the tightening of the nut 38 it should be understood that the center plates 8 may be firmly locked in a set adjustable position upon the respective sup porting or adjusting bolts 14 and 29.

Having thus described the invention what is claimed as new, is

1. A holder for use on crank shafts having a longitudinal slot provided with closed ends, a body having a reduced shoulder slidably mounted within. said slot, an externally threaded bolt passing through said shoulder, the ends of said bolt being anchored within said holder, whereby upon the rotation of said bolt, said shoulder will be moved to the anchored ends of said bolt holding the same against displacement.

2. A holder for use on crank shafts having an elongated slot formed therein and provided with closed ends, a head having a reduced shoulder slidably mounted within said slot, an externally threaded bolt passing through said shoulder and having its ends carried by said shoulder, whereby said bolt will be strengthened intermediate its ends,

said bolt being adapted to be rotated for moving said head, and means for holding said bolt against accidental rotation.

3. A. holder for use on crank shafts having an elongated slot formed therein and provided with closed ends, a head. having a reduced shoulder slidablyunounted within said slot, an externally threaded bolt passing through said shoulder and having its ends carried by said shoulder, whereby said bolt will be strengthened intermediate its ends, said bolt being adapted to be rotated fonmoving said head, a jamming nut carried upon said bolt and engaging the outer closed end of said slot,'whereby ajamming action will be imparted to the threads of said bolt for holding said bolt against accidental rotary movement.

4.. A. holder for use on crank shafts comprising an elongated body provided with a longitudinal slot having closed ends, said body having a socket formed therein and communicating with its outer end, an externally threaded bolt having a head formed thereon, said body having a socket formed at the inner end of said slot, said bolt projecting through said slot and having its inner end journaled in said last-mentioned socket. said head fitting within said first mentioned socket, whereby said head will be protected from accidental engagement with a foreign object, a head having a shoulder movably mounted within said slot, said bolt projecting through said shoulder, whereby upon the rotation of said bolt, said head will be moved.

5. A holder for use on crank shafts comprising an elongated body provided with a longitudinal slot having closed ends, said 'body having a socket formed therein and communicating with its outer end, an externally threaded bolt having a head formed thereon, said body having a socket formed at the inner end of said slot, said bolt pro jecting through said slot and having its inner end journaled in said last-mentioned socket, said head fitting within said first mentioned socket, whereby said head will be protected from accidental engagement with a foreign object, a head having a shoulder 6. A holder for use on crank shafts com- 7 prising an elongated body provided with a longitudinal slot having closed ends, said body having a socket formed therein and communicating with its outer end, an externally threaded bolt having a head formed thereon, said body having a socket formed at the inner end of said'slot. said bolt projecting through said slot and having its inner end journaled in said last-mentioned socket, said head. fitting within said first mentio ed socket, whereby said head will be protect 11 from accidental engagement with a foreign object, a head having a shoulder movably mounted within said slot, said bolt projecting through said shoulder, whereby upon the rotation of said bolt, said head will be moved, a jamming nut carried upon said bolt and engaging the outer closed end of said slot for causing a jamming action upon said threads, thereby holding, said bolt against accidental rotary movement.

In testimony whereof I hereunto aiiix my signature.

WILLIAM L. MANTHA. 

